EP1457168A1 - Zahnärztliche magnetische Befestigung und Verfahren zu deren Herstellung - Google Patents
Zahnärztliche magnetische Befestigung und Verfahren zu deren Herstellung Download PDFInfo
- Publication number
- EP1457168A1 EP1457168A1 EP04005964A EP04005964A EP1457168A1 EP 1457168 A1 EP1457168 A1 EP 1457168A1 EP 04005964 A EP04005964 A EP 04005964A EP 04005964 A EP04005964 A EP 04005964A EP 1457168 A1 EP1457168 A1 EP 1457168A1
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- EP
- European Patent Office
- Prior art keywords
- keeper
- axis diameter
- minor axis
- adsorbing surface
- major axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims description 35
- 230000000994 depressogenic effect Effects 0.000 claims abstract description 77
- 239000000696 magnetic material Substances 0.000 claims abstract description 56
- 238000003466 welding Methods 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims description 9
- 230000005389 magnetism Effects 0.000 claims description 5
- 230000004907 flux Effects 0.000 description 9
- 238000007796 conventional method Methods 0.000 description 8
- 210000001909 alveolar process Anatomy 0.000 description 7
- 210000000214 mouth Anatomy 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 210000004195 gingiva Anatomy 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 229910001004 magnetic alloy Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- ZPUCINDJVBIVPJ-LJISPDSOSA-N cocaine Chemical group O([C@H]1C[C@@H]2CC[C@@H](N2C)[C@H]1C(=O)OC)C(=O)C1=CC=CC=C1 ZPUCINDJVBIVPJ-LJISPDSOSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 206010020751 Hypersensitivity Diseases 0.000 description 1
- 208000026935 allergic disease Diseases 0.000 description 1
- 230000007815 allergy Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/225—Fastening prostheses in the mouth
- A61C13/235—Magnetic fastening
Definitions
- the present invention relates to a dental magnetic attachment comprising a set of a magnet structure for the dental magnetic attachment, which is to be fixed on an alveolar ridge side of a denture base, and a keeper for the dental magnetic attachment, which is to be fixed to an anchor tooth on an alveolar ridge in an oral cavity of a patient, for fixing a denture to an anchor tooth, particularly preferably an anterior tooth, on an alveolar ridge in an oral cavity of a patient by a magnetic attractive force, and a process for producing the same.
- a dental magnetic attachment comprising a magnetic structure having a covered permanent magnet fixed to an alveolar ridge side of the denture and a keeper formed with a soft magnetic material fixed to an anchor tooth on an alveolar ridge in an oral cavity of a patient, whereby the denture is fixed by using a magnetic attractive force effected between the magnetic structure and the keeper.
- the attachment does not have a part to be worn or broken as in a mechanical retainer, such as clasp, to prevent the retaining force from being decayed during a long term use, the direction of the detaching force may be inexact, whereby the denture can be easily designed and produced, and the denture can be easily attached and detached in an oral cavity, the attachment is excellent in estheticity without an exposed part as in a clasp, and the attachment can be easily cleaned.
- a magnetic structure referred to as a sandwich type having a rectangular shape is disclosed, for example, in JP-B-7-32784, which comprises a pair of yokes formed with an anticorrosive soft magnetic alloy set up toward a root plate, a spacer formed with an anticorrosive non-magnetic alloy provided on the side of the root plate between the pair of yokes, a magnet body disposed on the side of the spacer opposite to the root plate with an S pole and an N pole thereof facing the both of yokes respectively, and a case formed with an anticorrosive non-magnetic alloy covering the pair of yokes and the spacer except for the side facing the root plate.
- a magnetic structure referred to as a cap yoke type having a disk shape is disclosed, for example, in Japanese Patent No. 2, 795, 755, which comprises a yoke having a cup shape formed with a magnetic material having on one surface thereof a circular depressed part with the center agreeing with the central axis of the disk, and a permanent magnet having the same shape as the depressed part embedded therein, in which the depressed part is sealed by welding with a circular disk plate formed with a magnetic material through a non-magnetic ring member.
- the plane shape of the two kinds of a magnetic attachment comprising a magnetic structure and a keeper is a rectangular shape for the sandwich type magnetic structure or a disk shape for the cup yoke type magnetic structure due to advantages on configuration of the components and magnetic circuits.
- the retainer is generally designed and produced under consideration of a form of a denture and a form of a tooth, but the shape of the commercially available dental magnetic attachment at present is limited to the rectangular shape and the disk shape due to the structure of the magnetic structure.
- a form of a denture and a tooth cross sectional shape in the vicinity of gingiva of an anchor tooth, to which the keeper is to be fixed vary depending on regions, and in particular, the tooth cross sectional shape in the vicinity of gingiva of an anchor tooth, to which the keeper is to be fixed, generally largely varies between the an anterior tooth and a molar tooth. Therefore, the rectangular keeper is suitable for the anterior tooth part, which has an elongated elliptic tooth cross sectional shape, but the disk shape keeper is suitable for the molar tooth part, which has a nearly circular tooth cross sectional shape.
- the sandwich type magnetic structure having a rectangular shape is used for the anterior tooth part
- the cup yoke type magnetic structure having a disk shape is used for the molar tooth part, depending on the shapes of the keepers.
- the rectangular sandwich type magnet structure and the disk shape cup yoke type magnet structure can be used irrespective to the tooth cross sectional shape.
- the rectangular keeper and the sandwich type magnet structure suitable for the anterior tooth part can be used for the molar tooth part having a nearly circular tooth cross sectional shape.
- the sandwich type magnet structure cannot be used in the case where the thickness of the denture base, to which the magnetic structure is to be fixed, is too short, due to the larger thickness thereof than that of the cup yoke type magnet structure.
- the disk shape keeper and the cup yoke type magnet structure suitable for the molar tooth part is used in the anterior tooth part
- a disk shape keeper having a smaller size can be used because the tooth cross sectional shape in the anterior tooth part is an elongated elliptic shape, and therefore, a denture cannot be firmly fixed.
- a larger disk shape keeper is forcedly applied, it becomes difficult to fix the keeper to the tooth, and it is necessary that the tooth is excessively ground to cause such a problem in that a patient, who hopes to suppress the ground amount of the tooth as less as possible, suffers devastating agonies.
- An object of the present invention is to provide such a dental magnetic attachment comprising a set of a magnetic structure for the dental magnetic attachment, which is to be fixed on an alveolar ridge side of a denture base, and a keeper for the dental magnetic attachment, which is to be fixed to an anchor tooth on an alveolar ridge in an oral cavity of a patient, that satisfies the aforementioned requirements and is effective for a tooth having a nearly elliptic cross sectional shape, such as an anterior tooth, in the vicinity of gingiva of an anchor tooth, to which the keeper is to be fixed, and a process for producing the same.
- the magnetic structure for a dental magnetic attachment has a sufficient strength since it suffers forces from various directions due to the function thereof in an oral cavity.
- the cup yoke type magnet structure is advantageous against distortion of the magnet structure and local deformation at a part in contact with the keeper, owing to the high strength thereof in comparison to the sandwich type magnet structure, and the height of the cup yoke type magnet structure can be made low in comparison to that of the sandwich type, whereby the cup yoke type magnet structure can be widely applied. Therefore, it is advantageous in production of dentures in the case where the cup yoke type magnet structure can be used not only in the molar tooth part but also in the anterior tooth part owing to uniformity in production of dentures.
- the cup yoke type magnet structure generally has a circular disk shape, and a keeper having the same circular disk shape as the magnet structure is used to prevent magnetic flux from being leaked from the magnet structure.
- the inventors have investigated how to fix the circular keeper to a tooth having an elliptic cross sectional shape, such as an anterior tooth, in the vicinity of gingiva of an anchor tooth.
- a magnet structure is produced by a process comprising steps of: embedding a cylindrical permanent magnet in a circular depressed part of a cup yoke formed with a soft magnetic material having a shape having the circular depressed part at a central part thereof and an outer shape of a surface having the depressed part forming an externally convex curved line in a major axis and an externally convex curved line or a straight line in a minor axis continued to the externally convex curved line in the major axis with a minor axis diameter of 1.1 to 1.4 with respect to a diameter of the cylindrical permanent magnet being 1, and a ratio of a major axis diameter and the minor axis diameter (major axis diameter/minor axis diameter) of 1.02 to 2.0; and sealing the depressed part of the cup yoke by welding with a circular disk plate formed with a soft magnetic material through a non-magnetic ring seal to form a plane adsorb
- a magnet structure is produced by a process comprising steps of: embedding a cylindrical permanent magnet in a circular depressed part of a cup yoke formed with a soft magnetic material having a circular transversal cross sectional shape and having the circular depressed part at a central part thereof; sealing the depressed part of the cup yoke by welding with a circular disk plate formed with a soft magnetic material through a non-magnetic ring seal to form a plane surface, so as to produce a magnet structure having a circular transversal cross sectional shape, which is similar to that of the conventional technique; and ablating side parts of the cup yoke opposite to each other to a plane shape, so as to make a minor axis diameter of 1.1 to 1.4 with respect to a diameter of the cylindrical permanent magnet being 1, and a ratio of a major axis diameter and the minor axis diameter (major axis diameter/minor axis diameter) of 1.02 to 2.0, a magnet structure according to the
- a keeper is produced by a process comprising a step of ablating opposite side parts of a disk shape keeper formed with a soft magnetic material to a plane shape to form an adsorbing surface having a ratio of a major axis diameter and the minor axis diameter (major axis diameter/minor axis diameter) of 1.02 to 2.0
- a keeper according to the present invention can be easily produced only by ablating opposite side parts of a disk shape keeper according to the conventional technique to a plane shape.
- a dental magnetic attachment is produced by a process comprising steps of: preparing a keeper having an adsorbing surface having a circular plane shape formed with a soft magnetic material, and a magnetic structure comprising a cup yoke formed with a soft magnetic material having a circular depressed part at a central part thereof and an outer shape of a surface having the depressed part in the same shape as the adsorbing surface of the keeper, and a cylindrical permanent magnet embedded in the depressed part with the depressed part being sealed by welding with a circular disk plate formed with a soft magnetic material through a non-magnetic ring seal to form a plane adsorbing surface; and ablating simultaneously opposite side parts of the magnet structure and those of the keeper in a state where the adsorbing surface of the magnet structure and the adsorbing surface of the keeper are attached to each other through magnetism, so as to obtain a keeper having an adsorbing surface having a ratio of a
- the invention relates to:
- the adsorbing surface of the keeper has a shape forming the externally convex curved line in the major axis, which is a circular arc having a constant radius with the same center as the center of the major axis, and a straight line in a minor axis continued to the circular arc in the major axis, it is preferred since the keeper can be easily processed.
- the adsorbing surface of the keeper has an elliptic shape, it is preferred since the shape of the adsorbing surface of the keeper can be further accommodated to the tooth cross sectional shape in the anterior tooth part.
- the adsorbing surface of the magnet structure has a shape forming straight lines in parallel to each other in the minor axis, and plane side surfaces opposite to each other are provided on both sides of the cup yoke as being continued from the straight lines in the minor axis, and further in the case where the plane side surfaces opposite to each other are substantially in parallel to each other, it is preferred since the cup yoke can be easily produced.
- the dental magnetic attachment according to the present invention is constituted from a keeper having an adsorbing surface forming an externally convex curved line in a major axis and an externally convex curved line or a straight line in a minor axis continued to the externally convex curved line in the major axis and having a ratio of a major axis diameter and a minor axis diameter (major axis diameter/minor axis diameter) of 1.02 to 2.0, and a magnet structure comprising a cup yoke formed with a soft magnetic material and a cylindrical permanent magnet embedded in a circular depressed part provided in a central part of the cup yoke, with the depressed part of the cup yoke being sealed by welding with a circular disk plate formed with a soft magnetic material through a non-magnetic ring seal to form a plane adsorbing surface having the substantially same shape as the adsorbing surface of the keeper.
- the adsorbing surface of the keeper has such a shape that is accommodated to the tooth cross sectional shape in the anterior tooth part to facilitate fixation thereof to an anchor tooth in the anterior tooth part, and the shape of the adsorbing surface of the cup yoke type magnet structure, which is generally a circular shape, can be accommodated to the shape of the adsorbing surface of the keeper, whereby the cup yoke type magnet structure can be applied to the anterior tooth part.
- the path, through which magnetic flux emitted from the cylindrical permanent magnet in the magnet structure runs, is partially narrowed to fail to obtain a sufficient magnetic force.
- the short axis diameter of the adsorbing surface of the magnet structure is 1.1 to 1.4 with respect to the diameter of the cylindrical permanent magnet being 1, and therefore, the path for the magnetic flux can be ensured to obtain a sufficient magnetic force by defining the shape of the adsorbing surface of the cup yoke type magnet structure with respect to the diameter of the cylindrical permanent magnet.
- the keeper can be easily processed in the case where the adsorbing surface of the keeper has a shape forming the externally convex curved line in the maj or axis, which is a circular arc having a constant radius with the same center as the center of the major axis, and a straight line in a minor axis continued to the circular arc in the major axis; the shape of the adsorbing surface of the keeper can be further accommodated to the tooth cross sectional shape in the anterior tooth part in the case where the adsorbing surface of the keeper has an elliptic shape; the cup yoke can be easily produced in the case where the adsorbing surface of the magnet structure has a shape forming straight lines in parallel to each other in the minor axis, and plane side surfaces opposite to each other are provided on both sides of the cup yoke as being continued from the straight lines in the minor axis, and further in the case where the plane side surfaces opposite to each other are substantially in parallel to
- the process for producing a magnet structure comprises steps of: embedding a cylindrical permanent magnet in a circular depressed part of a cup yoke formed with a soft magnetic material having a shape having the circular depressed part at a central part thereof and an outer shape of a surface having the depressed part forming an externally convex curved line in a major axis and an externally convex curved line or a straight line in a minor axis continued to the externally convex curved line in the major axis with a minor axis diameter of 1.1 to 1.4 with respect to a diameter of the cylindrical permanent magnet being 1, and a ratio of a major axis diameter and the minor axis diameter (major axis diameter/minor axis diameter) of 1.02 to 2.0; and sealing the depressed part of the cup yoke by welding with a circular disk plate formed with a soft magnetic material through a non-magnetic ring seal to form a plane
- the process for producing a magnet structure comprises steps of: embedding a cylindrical permanent magnet in a circular depressed part of a cup yoke formed with a soft magnetic material having a circular transversal cross sectional shape and having the circular depressed part at a central part thereof; sealing the depressed part of the cup yoke by welding with a circular disk plate formed with a soft magnetic material through a non-magnetic ring seal to form a plane surface, so as to produce a magnet structure having a circular transversal cross sectional shape; and ablating side parts of the cup yoke opposite to each other to a plane shape, so as to make a minor axis diameter of 1.1 to 1.4 with respect to a diameter of the cylindrical permanent magnet being 1, and a ratio of a major axis diameter and the minor axis diameter (major axis diameter/minor axis diameter) of 1.02 to 2.0. Therefore, the magnet structure according to the present invention can be produced only
- the process for producing a keeper comprises a step of ablating opposite side parts of a disk shape keeper formed with a soft magnetic material to a plane shape to form an adsorbing surface having a ratio of a major axis diameter and the minor axis diameter (major axis diameter/minor axis diameter) of 1.02 to 2.0. Therefore, the keeper according to the present invention can be produced only by ablating the side parts opposite to each other of a disk shape keeper similar to that of the conventional technique.
- the process for producing a dental magnetic attachment comprises steps of: preparing a keeper having an adsorbing surface having a circular plane shape formed with a soft magnetic material, and a magnet structure comprising a cup yoke formed with a soft magnetic material having a circular depressed part at a central part thereof and an outer shape of a surface having the depressed part in the same shape as the adsorbing surface of the keeper, and a cylindrical permanent magnet embedded in the depressed part with the depressed part being sealed by welding with a circular disk plate formed with a soft magnetic material through a non-magnetic ring seal to form a plane adsorbing surface; and ablating simultaneously opposite side parts of the magnet structure and those of the keeper in a state where the adsorbing surface of the magnet structure and the adsorbing surface of the keeper are attached to each other through magnetism, so as to obtain a keeper having an adsorbing surface having a ratio of a major axis diameter and the minor
- Fig. 1 is a perspective view showing one embodiment of a keeper and a magnet structure of a dental magnetic attachment according to the present invention
- Fig. 2 is a cross sectional view showing the magnet structure shown in Fig. 1
- Fig. 3 is a perspective view showing another embodiment of a keeper and a magnet structure of a dental magnetic attachment according to the present invention
- Fig. 4 is a perspective view showing still another embodiment of a keeper and a magnet structure of a dental magnetic attachment according to the present invention
- Fig. 5 is aperspectiveview showing a further embodiment of a keeper and a magnet structure of a dental magnetic attachment according to the present invention
- Fig. 6 is an elevational view showing the magnet structure shown in Fig. 5.
- numeral 1 denotes a keeper formed with a soft magnetic material excellent in corrosion resistance, such as 26Cr-1Mo stainless steel, having an adsorbing surface 1a forming an externally convex curved line in a major axis and an externally convex curved line or a straight line in a minor axis continued to the externally convex curved line in the major axis and having a ratio of a major axis diameter and a minor axis diameter (major axis diameter/minor axis diameter) of 1.02 to 2.0, and the adsorbing surface 1a has such a shape that is accommodated to the tooth cross sectional shape in the anterior tooth part.
- a soft magnetic material excellent in corrosion resistance such as 26Cr-1Mo stainless steel
- the adsorbing surface 1a of the keeper 1 has a shape forming the externally convex curved line in the major axis, which is a circular arc having a constant radius with the same center as the center of the major axis, and a straight line in a minor axis continued to the circular arc in the major axis as shown in Fig. 1, it is preferred since the keeper can be easily processed.
- the adsorbing surface 1a of the keeper 1 has an elliptic shape as shown in Fig. 4, it is preferred since the shape of the adsorbing surface 1a of the keeper 1 can be further accommodated to the tooth cross sectional shape in the anterior tooth part.
- a prehension bar 1b is provided on a side part of the keeper 1 as shown in Fig. 3, it is preferred since the workability upon attaching the keeper to an anchor tooth is improved.
- a column 1c is provided on a surface of the keeper 1 opposite to the adsorbing surface 1a, it is preferred since the keeper 1 can be firmly attached to an anchor tooth.
- the numeral 2 denotes a cup yoke formed with a soft magnetic material excellent in corrosion resistance, such as 26Cr-1Mo stainless steel, and the outer shape of the surface thereof having a depressed part 2a formed thereon is substantially the same as the outer shape of the adsorbing surface 1a of the keeper 1.
- the outer shape of the surface having a depressed part 2a formed thereon is a shape forming straight lines in parallel to each other in the minor axis, and plane side surfaces 2b opposite to each other are provided on both sides of the cup yoke 2 as being continued from the straight lines in the minor axis, and further in the case where the plane side surfaces 2b opposite to each other of the cup yoke 2 are substantially in parallel to each other, it is preferred since the cup yoke 2 can be easily produced.
- the numeral 3 denotes a cylindrical permanent magnet, such as an Nd-Fe-B series magnet, embedded in the circular depressed part 2a provided in the central part of the cup yoke 2.
- the cylindrical permanent magnet 3 preferably has the same shape as the circular depressed part 2a.
- the minor axis diameter of the adsorbing surface 1a of the keeper 1 is 1.1 to 1.4 with respect to the diameter of the cylindrical permanent magnet 3 being 1.
- the numeral 4 denotes a non-magnetic ring seal.
- the non-magnetic ring seal is preferably an Ni free high nitrogen content stainless steel containing substantially no nickel, such as austenite stainless steel used as a spacer of a magnetic attachment for a denture described in JP-A-2000-252289, whereby the risk of causing allergy can be reduced.
- the numeral 5 denotes a circular disk plate formed with the substantially same soft magnetic material as the cup yoke 2 for sealing by welding the depressed part 2a of the cup yoke 2, in which the cylindrical permanent magnet 3 is embedded, through the non-magnetic ring seal 4, and fulfills such a role that a magnetic attractive force of the cylindrical permanent magnet 3 is efficiently effected to the keeper 1.
- the numeral 6 denotes a magnet structure having the cup yoke 2 formed with a soft magnetic material and the cylindrical permanent magnet 3 embedded in the circular depressed part 2a provided in the central part of the cup yoke 2, with the depressed part 2a of the cup yoke 2 being sealed by welding with the circular disk plate 5 formed with a soft magnetic material through the non-magnetic ring seal 4 to form a plane adsorbing surface 6a having the substantially same shape as the adsorbing surface 1a of the keeper 1.
- the adsorbing surface 6a of the magnet structure 6 has a minor axis diameter of 1.1 to 1.4 with respect to the diameter of the cylindrical permanent magnet 3 being 1, and therefore, the path for the magnetic flux emitted from the cylindrical permanent magnet 3 can be ensured to obtain a sufficient magnetic force.
- a ratio of an area (Sa) occupied by the cup yoke 2 on the adsorbing surface 6a of the magnet structure 6 and a transversal cross sectional area (Sm) of the cylindrical permanent magnet 3 (Sa/Sm) is 0.8 to 1.5, it is preferred since the path, through which the magnetic flux runs, can be further ensured.
- the magnet structure 6 can be easily produced owing to the relatively simple entire shape thereof.
- the transversal cross sectional area of the magnet structure 6 in parallel to the adsorbing surface 6a is increased away from the adsorbing surface 6a as shown in Fig. 3, or in the case where the transversal cross sectional area of the magnet structure 6 in parallel to the adsorbing surface 6a is increased away from the adsorbing surface 6a up to a certain position and is then decreased upon approaching the opposite surface as shown in Figs. 5 and 6, it is preferred since the adhesion to a resin constituting a denture base can be improved.
- the process for producing the magnet structure 6 is roughly classified into two categories. One of them is such a process in that a cup yoke 2 is firstly produced to have an outer shape of the surface having a depressed part 2a formed thereon similar to a tooth cross sectional shape in the anterior toot part, and the magnet structure 6 is then produced by using the cup yoke 2 thus produced.
- the other of them is such a process in that a conventional magnet structure 6' having a circular cross sectional shape is firstly produced, and side parts opposite to each other of the cup yoke 2' having a circular transversal cross sectional shape are then ablated to a plane shape to produce the magnet structure 6.
- the method for obtaining the cup yoke 2 thus formed is not particularly limited, and for example, it can be obtained by precision casting or press molding or by such a method in that a rod material having been processed on the side parts thereof to be accommodated to the shape of the side parts of the cup yoke 2 to be produced is cut into pieces, and the depressed part 2a is provided on the piece by cutting.
- the outer shape of the surface of the cup yoke 2 thus formed having the depressed part 2a formed thereon has a minor axis diameter of 1.1 to 1.4 with respect to the diameter of the cylindrical permanent magnet being 1 and a ratio of a major axis diameter and a minor axis diameter (major axis diameter/minor axis diameter) of 1.02 to 2.0, and the minor axis sides may not necessarily form straight lines but may form externally convex curved lines continued to the externally convex curved line in the major axis as shown in Fig. 3 or may form an elliptical shape as shown in Fig. 4.
- the cylindrical permanent magnet 3 is embedded in the circular depressed part 2a provided in the central part of the cup yoke 2, and the depressed part 2a is then sealed by welding with the circular disk plate 5 formed with a soft magnetic material through the non-magnetic ring seal 4 to cover the cylindrical permanent magnet 3 to complete the plane adsorbing surface 6a, whereby the magnet structure 6 according to the present invention can be easily produced by using the cup yoke 2 formed to be accommodated to the tooth cross sectional shape in the anterior tooth part in the manner similar to the conventional technique.
- the cylindrical permanent magnet 3 is embedded in a depressed part 2a of the cup yoke 2' formed with a soft magnetic material having a circular transversal cross sectional shape, and the depressed part 2a of the cup yoke 2' is then sealed by welding with the circular diskplate 5 formed with a soft magnetic material through the non-magnetic ring seal 4 to form a plane surface, so as to produce the magnet structure 6' having a circular transversal cross sectional shape.
- a conventional disk shape cup yoke 2' can be used as it is, whereby the magnet structure 6 can be produced at low cost, and the conventional production technique can be utilized.
- protrusions or grooves along the transversal cross sectional surface of the cup yoke 2 or the cup yoke 2' having a circular transversal cross sectional shape are provided on at least a part of the side parts of the cup yoke 2 or the cup yoke 2' having a circular transversal cross sectional shape, or in the case where after fabricating the magnet structure 6, at least a part of the side parts of the cup yoke 2 is cut to provide a groove 2c along the transversal cross sectional surface of the cup yoke 2, it is preferred since the adhesion to a resin constituting a denture base is improved.
- the keeper 1 can be produced by punching, in the case where side parts of a keeper 1 formed with a soft magnetic material having a disk shape are ablated to a plane shape to have a ratio of a major axis diameter and a minor axis diameter (major axis diameter/minor axis diameter) of 1.02 to 2.0, the keeper 1 can be easily produced only by ablating the side parts opposite to each other of the conventional keeper 1 having a disk shape.
- a keeper 1' having a circular adsorbing surface 1a' formed with a soft magnetic material
- a magnetic structure 6' comprising a cup yoke 2 formed with a soft magnetic material having a circular depressed part 2a at a central part thereof and an outer shape of a surface having the depressed part 2a formed thereon in the same shape as the adsorbing surface 1a' of the keeper 1', and a cylindrical permanent magnet 3 embedded in the depressed part 2a with the depressed part being sealed by welding with a circular disk plate 5 formed with a soft magnetic material through a non-magnetic ring seal 4 to form a plane adsorbing surface 6a.
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- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Dentistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Dental Prosthetics (AREA)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003069053 | 2003-03-14 | ||
| JP2003069053 | 2003-03-14 | ||
| JP2003424948A JP2004298611A (ja) | 2003-03-14 | 2003-12-22 | 歯科用磁性アタッチメント及びその製造方法 |
| JP2003424948 | 2003-12-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1457168A1 true EP1457168A1 (de) | 2004-09-15 |
Family
ID=32775278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04005964A Withdrawn EP1457168A1 (de) | 2003-03-14 | 2004-03-12 | Zahnärztliche magnetische Befestigung und Verfahren zu deren Herstellung |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20040241612A1 (de) |
| EP (1) | EP1457168A1 (de) |
| JP (1) | JP2004298611A (de) |
| AU (1) | AU2004201091A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6399088B2 (ja) * | 2014-04-04 | 2018-10-03 | 日立金属株式会社 | 歯科用磁性アタッチメント磁石構造体 |
| DE102019114009B4 (de) * | 2019-05-24 | 2022-04-28 | Kaub GmbH & Co. KG | Verfahren zur Herstellung einer Prothese, ein Abforminstrument zum Einbringen einer Abformmasse in den Mundraum eines Patienten sowie ein Handhabungswerkzeug zum Einbringen eines Verankerungsmagneten |
| EP4014922B1 (de) * | 2020-12-16 | 2024-01-24 | Ivoclar Vivadent AG | Dentales befestigungssystem |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4209905A (en) * | 1977-05-13 | 1980-07-01 | University Of Sydney | Denture retention |
| US5013243A (en) * | 1988-06-01 | 1991-05-07 | Aichi Steel Works, Limited | Denture attachment |
| JPH0732784B2 (ja) | 1988-06-01 | 1995-04-12 | 愛知製鋼株式会社 | 義歯アタッチメント |
| EP0719524A1 (de) * | 1994-07-15 | 1996-07-03 | Hitachi Metals, Ltd. | Struktur zur stabilisierung eines kunstzahns mit einem permanentmagneten, kunstzahnstabilisierungshalterung und magnetische kunstzahnbefestigung |
| EP0764428A1 (de) * | 1995-03-20 | 1997-03-26 | Aichi Steel Works, Ltd. | yagnetische zahnärztliche Befestigungseinrichtung |
| JP2000252289A (ja) | 1999-03-03 | 2000-09-14 | Toshiba Corp | バイポーラトランジスタとその製造方法 |
| US6299450B1 (en) * | 1998-04-23 | 2001-10-09 | Aichi Steel Corporation | Dental magnetic attachment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3266518B2 (ja) * | 1996-08-28 | 2002-03-18 | エスエムケイ株式会社 | プラグとジャックの接続構造 |
| JP2002186630A (ja) * | 2000-12-20 | 2002-07-02 | Gc Corp | 義歯用磁性アタッチメント |
-
2003
- 2003-12-22 JP JP2003424948A patent/JP2004298611A/ja active Pending
-
2004
- 2004-03-12 EP EP04005964A patent/EP1457168A1/de not_active Withdrawn
- 2004-03-15 US US10/799,878 patent/US20040241612A1/en not_active Abandoned
- 2004-03-15 AU AU2004201091A patent/AU2004201091A1/en not_active Abandoned
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4209905A (en) * | 1977-05-13 | 1980-07-01 | University Of Sydney | Denture retention |
| US5013243A (en) * | 1988-06-01 | 1991-05-07 | Aichi Steel Works, Limited | Denture attachment |
| JPH0732784B2 (ja) | 1988-06-01 | 1995-04-12 | 愛知製鋼株式会社 | 義歯アタッチメント |
| EP0719524A1 (de) * | 1994-07-15 | 1996-07-03 | Hitachi Metals, Ltd. | Struktur zur stabilisierung eines kunstzahns mit einem permanentmagneten, kunstzahnstabilisierungshalterung und magnetische kunstzahnbefestigung |
| EP0764428A1 (de) * | 1995-03-20 | 1997-03-26 | Aichi Steel Works, Ltd. | yagnetische zahnärztliche Befestigungseinrichtung |
| US6299450B1 (en) * | 1998-04-23 | 2001-10-09 | Aichi Steel Corporation | Dental magnetic attachment |
| JP2000252289A (ja) | 1999-03-03 | 2000-09-14 | Toshiba Corp | バイポーラトランジスタとその製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| US20040241612A1 (en) | 2004-12-02 |
| AU2004201091A1 (en) | 2004-09-30 |
| JP2004298611A (ja) | 2004-10-28 |
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